function clearLocations() {
infoWindow.close();
for (var i = 0; i < markers.length; i++) {
markers[i].setMap(null);
}
markers.length = 0;

markers[i].setMap(null);

map = new google.maps.Map(document.getElementById("map"), {
    center: new google.maps.LatLng(35.1611, -114.4775),
    zoom: 6,
    mapTypeId: 'roadmap',
    mapTypeControlOptions: {style: google.maps.MapTypeControlStyle.DROPDOWN_MENU}
    });